Dane Clarke
New member
Mike,
Re: Technical Interpretation
I am writing to you in order to get a technical interpretation regarding the following scenario:
Facility Description:
On a campus, there is a 115kV/13.8kV primary substation, 140MVA, which is fed from a 115kV overhead utility line. The metering is in 115KV. The 115kV/13.8kV primary substation feed several buildings throughout the campus at 13.8 KV with several 13.8kV/480V secondary substations in each building.
Grounding Equipment Conductor Questions:
1. Are the feeds coming from the 115kV/13.8kV primary substation, which supply the 13.8kV/480V secondary substations considered to be a service or a feeder?
2. Some of the existing feeders are in a duct bank with a common bare 4/0 CU conductor embedded in the top of the duct bank. It is an Equipment Grounding Conductor (EGC) required for each 13.8 KV feeder or the common ground would be enough?
3. If so, does the Equipment Grounding Conductor (EGC) have to be insulated?
Re: Technical Interpretation
I am writing to you in order to get a technical interpretation regarding the following scenario:
Facility Description:
On a campus, there is a 115kV/13.8kV primary substation, 140MVA, which is fed from a 115kV overhead utility line. The metering is in 115KV. The 115kV/13.8kV primary substation feed several buildings throughout the campus at 13.8 KV with several 13.8kV/480V secondary substations in each building.
Grounding Equipment Conductor Questions:
1. Are the feeds coming from the 115kV/13.8kV primary substation, which supply the 13.8kV/480V secondary substations considered to be a service or a feeder?
2. Some of the existing feeders are in a duct bank with a common bare 4/0 CU conductor embedded in the top of the duct bank. It is an Equipment Grounding Conductor (EGC) required for each 13.8 KV feeder or the common ground would be enough?
3. If so, does the Equipment Grounding Conductor (EGC) have to be insulated?
